Faut-il réguler le libéralisme?

The study of capitalism history shows that periods when free trade and state unintervention theories are developing are periods of crises in social organization of capital accumulation. Then follows a new period of theoretical proof of the utility of institutional regulating interventions when a new order in social organization of capital accumulation is established. The analysis of the two periods of non interference policy during the last third of the XIXth century and between the two world wars realised in this paper illustrate this thesis. The effects of international competition and of technological changes resulting induce a new period of instability at the end of this XXth century. Theories of laisser-faire developing today are the results of this new situation. Does an issue exist to the actual crises, and what issue ? The question following is to know who is today in position to hold the power to reduce the uncertainty and to lay down new social rules for the organization of a new capital accumulation process, in a global world exchange system.